(CNN) -- Three Napoli fans received hospital treatment and one remains in a critical condition Sunday after violence marred the Italian Cup final between Napoli and Fiorentina in Rome.

Reports from domestic news agency ANSA said three Napoli supporters suffered gunshot wounds in clashes before Saturday's match in the Olympic stadium, while another from Rome was hospitalized with injuries.

The condition of one of the Napoli fans, a 30-year-old, remained "critical but stable" after an operation to remove a bullet from near his spinal cord, doctors said.

There have been conflicting reports of exactly who was responsible for the incidents and who fired the shots, but with almost 30,000 fans from each club arriving in a capital already boasting two other clubs, Roma and Lazio, the potential for violence was high and sadly this proved the case.